The usecase of NutriScore definitly needs to be explained. I thought it was ridiculous until I read a small brochure about it. NutriScore is a comparation tool :
Hesitating btw 2 brand ? NutriScore
Hesitating btw 2 premade meals ? NutriScore
Hesitating btw Nutella and Jam ? NutriScore
Hesitating btw having cheese or dessert this evening ? NutriScore
It’s about comparing at first glance 2 items of food that could be interchangeable in your current situation.
Still it’s not perfect. For example butter has a worst NutriScore than margarine bc margarine has l’ESS fat but butter fat is of better quality and I’m not sure less fat should be considered better when shopping for fat.